Spindle drive for machine tools



my v Z fl u 65 7 MW...

Jam 5, 1932.

v A. E. JACOBS SPINDLE DRIVE FOR MACHINE TOOLS Filed Sept. 12, 1950Patented Jan. 5, 1932 entree STATES Pet -NT"OFFI ARTHUR E. JACOBS, OFROCKFORD, ILLINOIS;-ASSIGNOR1'IO'THE I NGER SOLL, MILLING IIIACHINECOMPANY, OF ROCKFORD, ILLINOIS, A .CORPGRA'IION'. OF ILLINOIS sPINnLEDRIVE FOR adame roots Application filed September 12, 1930. serial3164481512.

reamers, taps and other like tools which are detachably connected indriving relation with a driving element.

As heretofore practiced it has been customary to rely upon a tang on theend of the tapered shank of the tool to provide a driving fit betweenthe driving and driven elements for the tool such as the spindle and thesleeve in which the spindle is received. In

the present instance, this tang fitting is discarded in favor of amultiple-spline fitting and the multiple-spline fitting is used in amanner to provide a more positive and reliaalole drive for the, toolwithout sacrificing production requirements. v

In the accompany drawings:

Fig. 1- is a view partly in section, showing the preferred form of theinvention;

Fig. 2 is a similar View showing a modified form of the invention;

Fig. 3 is a view in cross-section on the line 3-3, Fig. 1;

Fig. 4 is a view in cross-section, on the line H, Fig. 2; and

Fig. 5 is a detail view in section,.of still another form of theinvention.

Referring now to the drawings in detail, attention will first be invitedto Fig. 1 wherein 5 represents the driving element, shown as preferablycomprising a sleeve-like device.

This sleeve 5 is made with a tapered inter nal bore 6 terminating in aslot 7 which extends through the sleeve. The opposite end of the taperedbore 6 opens into an enlargement 8 which in turn terminates in areduction 9 extending to the end 10 of the sleeve.

11 represents a tool which in the present illustration is shown aseither a drill, or other boring device. The tool is made with a drivingelement such as the spindle 12 having a tapered shank 13 adapted tooccupy the tapered bore 6 of the sleeve. The tapered shank 13 functionsas a locating pilot and snugly fits within the bore for this purpose.The spindle is made with a multiple-sp1ine enlargement 1:4 in advance ofthe taper 13 thisspl ined portion is made co interlock wlth a companionspline in the reduction 9 of th'e-"sleeve; Y By means of themultiplespline fi-tt-ing thus provided and with-the c0,-

operationof thelocatingpilot provided by the taper 13;'the toolll, be ita drill or other rotary tool," may be'connected in positive drivingrelation with sleeve 5. The slot '7 in the' sleeve is provided toaccommodate a taperedl're'y for detaching the tool from the sleeve, whenoccasion demands. V I t is, o f course, understood that-the usualmachining"precautionswill he used'in falori eating the tool. end of thetapered bore 6 is provided to accommodate the shaping toolwith which thespline onthe inside ofthe'sleeveis made Fig. 2 illustrates a detailmodification of the same principle. In this form instead of 7 arranging'the spline at the end 10 of the sle'eve5" it is inset'iirom'the'end asat'15. The sleeve is further recessed out as'at 16 and providedwit'hinternal threadsfor the receptionofa split nut 17. The use of this splitnut 17 provides an elongated support or bearing 11 commencing at theenlargementB and terminating atthe end 180i" the head 'of the nut 17.The straight portion 19 ofthe intern-a1 bore inthe sleeve is splinedtointerg lock with the spline 20 on the toolspin'dle,

The enlargement 8 at the otherwise, theparts are arranged the same asin- Fig. -1 ,-th'at is to say the tapered shank is employed as well asthe slot 7 and the tapered'hore 6. I

Referring now to Fig. 5', attention is called to still anothermodification ofthe principle whereinthe multiple Spline fitting betweenthe spindle l2 .and'the sleeve 5 is arranged intermediate the taperedshank 13 and an. enlargement 21 on the spindle. The sleeve is made withthe same enlarged but the spline in the sleeve is provided for a slightrestriction in the bore of the sleeve as at 22. second enlargement 23 isarranged in advance of the splined portion 22 and continues to the end10 of the sleeve. The ring-like enlargement 21 on the spindle 12 has adiameter equal to the root of the spline in the sleeve and provides ahearing or support in advance of the spline so that with the supportprovided by the taper 13 the shank of the tool is supported on oppositesides of the spline.

I have shown three embodiments of the de vice all of which involve thesame principle of a multiple-spline fitting serving as a drive betweenthe driving and driven elements of the tool, however, there are otherforms that may be used to put the invention to practical use and thereare tools other than the types shown and described in connection Withwhich the invention may be used. I therefore do not Wish to be limitedto the constructions selected for illustrating the invention. Havingthus described and shown an embodiment of this invention, What I claimand desire to secure by Letters Patent of the United States is:

1. A machine tool drive comprising a driving element having a taperedinternal bore closed 'at its inner end and terminating in an enlargedthreaded recess at its outer end, a tapered driven element adapted tooccupy the bore in said driving element, a multiplespline fitting Withinsaid bore between said driving and driven elements and extending in thedirection of the axis ofthe driving and driven elements and a nut on thedriven element threaded into said enlarged recess at the outer end ofthe bore providing a support for the driven element in advance of saidspline fitting. V v

2. A machine tool drive comprising a driving element having a taperedbore, a tool spindle having a tapered shank adapted to occupy said bore,a multiple-spline fitting serving as a drive for connecting saidelements in driving relation and a support for the tool spindleinadvance o1 said'multiplespline fitting Within the driving element,comprising an enlargement on said spindle providinga close sliding fitbetween the spindle and the drivingelement adjacent the end of saiddriving element.

3. A drive for machine tools, comprising a driving element having aninternal bore ter- Ininating in a non-tapered enlargement, a

tool spindle adapted to occupy said bore and a multiple splined fittingbetween the tool spindle and the drivingelement Within said non-taperedenlargement of the bore of the driving element. 7

Signed at Rockford, in the county of Winnebago, and State of Illinois,this 10th day of September, 1930.

ARTHURE. JACOBS.

